Differences in thermal tolerance among sockeye salmon populations
Version 2 2024-06-04, 13:23Version 2 2024-06-04, 13:23
Version 1 2017-11-24, 16:18Version 1 2017-11-24, 16:18
journal contribution
posted on 2024-06-04, 13:23authored byEJ Eliason, Timothy ClarkTimothy Clark, MJ Hague, LM Hanson, ZS Gallagher, KM Jeffries, MK Gale, DA Patterson, SG Hinch, AP Farrell
Climate change-induced increases in summer water temperature have been associated with elevated mortality of adult sockeye salmon (Oncorhynchus nerka) during river migration. We show that cardiorespiratory physiology varies at the population level among Fraser River sockeye salmon and relates to historical environmental conditions encountered while migrating. Fish from populations with more challenging migratory environments have greater aerobic scope, larger hearts, and better coronary supply. Furthermore, thermal optima for aerobic, cardiac, and heart rate scopes are consistent with the historic river temperature ranges for each population. This study suggests that physiological adaptation occurs at a very local scale, with population-specific thermal limits being set by physiological limitations in aerobic performance, possibly due to cardiac collapse at high temperatures.
History
Journal
Science
Volume
332
Pagination
109-112
Location
Washington, D.C.
eISSN
1095-9203
Language
eng
Publication classification
C Journal article, C1.1 Refereed article in a scholarly journal
Copyright notice
2017, The Authors
Issue
6025
Publisher
American Association for the Advancement of Science